For R1, you'll either be invited or not invited to interview on Nov 28.
Then on decision day in January you'll find out if you were accepted (for those who interviewed) or if you're waitlisted/rejected (for both those who interviewed AND for those not invited to interview in Nov).
If you're WL in January and have already interviewed, you wait until you get a decision - either during the R2/R3 decision dates or later on anytime in the summer.
If you were WL without interview on the January decision date, then you can be invited to interview on the R2 invite day. You can also not be invited again and then you'll have to wait until the R2 decision date to see if you remain on the waitlist or if you're rejected.
Continue the pattern for R3.
While you can submit additional information anytime after you're WL, you will only receive status updates on the invite or decision dates, unless it's after R3/the summer months as all the official deadline dates would have already passed by then.
Does that help?
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